I'm
Sorry, but I've had to place a restriction on the tide calculator of a
maximum of 60 prediction requests per user per hour. I apologise for any
inconvenience, but this is due to one site visitor running an automated
program that made 38,000 requests in 2 hours, (which slowed down the whole
site).

(Please try again after one hour, when you will
be able to make another 60 requests)